Sound-amplifier for phonographs.



W l TNESSES C. PDENNHARDT v Hi THIMGAN.

SOUND AMPLIFIER FOR PHONO GBAPHS. APPLICATION FILED-SEPT. r, 1915..

Patented Apr. 23,1918.

JEEI E IN VE TOR. I I 5- E Herman T/izmgan BY W n M g ,I S fa i raa nnr -oFF oE.

To all u /writ"; may emocrat Beit known that I, HERMAN il n'iircan,

a "citizen ofthe United States, and a resi- I dent of the' city and county of Denver, ,State of Colorado, have invented certain new and useful Improvements in Sound Amplifiers for Phonographs; and it do de 'clare'tlie"following tobe a full, clear, and

exact description oi'lmy invention,- snch as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in means which, when used in conjunction with the horn of a phonograph, will amplify the sound of the instrument, obviate the harsh, metallic sound so apparent in such instruments, and eliminate all unnatural eondi-' tions in the reproduction of the voice or sound.

Another object of my invention is to pro vide means of this class which will greatly improve the reproduction of sound.

-With this and other objects in View, which will become apparent in the following detailed description, I Will proceed to describe my invention with reference to the accompanying drawings. In these drawings, Figure 1 is an elevation view of-the invention, partiallyin section; Fi 2 is a longitudinal sectional view taken on the line 22, Fig. 1; and Fig. 3 is a cross-sectional view taken on the line 33, Fig. 2.

Corresponding or like parts are referred to in the vfollowing description, and indicated in all views of the accompanying drawings, by the same reference characters.

Let the numeral 5 designate a casing upon which the mechanism and construction embodying my invention is supported. Within this casing-I arrange a barrelshaped shell 6, formed of sound-proof material or other suitable material which has tendency to reflect or amplify sound. This casing thus forms a chamber therein, and the upper extremity of the casing 6 is open, and communicates with an opening 7 formed in the lower side of the phonograph horn 8. This opening is controlled by a sliding member 9, whereby the said opening 7 may be either reduced or increased in size to govern the amplification of the sound.

The bottom wall of the sound transmitting horn 8, near the sound receiving extremity thereof, is provided with a curved portion 15, which forms a concave surface Specificationof Letters Patent.

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A alicaticn filed/Seatezhber 7, 1915. Serial No. 49 218.,

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continuing to the opening 7, whereby the sound "vibrations are deflected directly through the opening 7 into thebarrel-shaped shelltli 1 The usual turntable 10 is'provided, to-

naled on the body of the horn, as shown at 13. The casing 5 is provided with an auxiliary chamber '14, in which the horn 8 is disposed. 1 l

in operation and use, the sound as reproduced by the instrument, is deflected into the casing *3, wherein it is amplified and the unnatural conditions eliminated; the amplified sound waves being then reflected out of the casing 6 and throughthe horn 8. While I have described and illustrated herein a specific form of my invention, it is understood that I am not limited thereto, and that the same may be modified and varied without departing from the spirit of my invention or the scope of the appended claims.

Having thus described my invention, what I claim, and desire to secure by Letters-Patcut, is

1. In means for modulating sound emanating from talking machines, the combination with a horn having a portion of its bottom approximately horizontally disposed and the other portion thereof curved, of a casing forming a single chamber only, said horn having a single opening only in the bottom thereof bordered on one side by the curved portion of the horn. said opening being of less area than the cross sectional area of the chamber and establishing com- 'munication between said horn and said chamber, and said opening being in axial alinement with the longitudinal axis of said chamber directly opposite the induction opening of the horn and intersected by the vertical plane of the longitudinal axis of the horn continued in a straight line from one extremity of said horn to the other.

2. In means for modulating sound emanating from talking machines, the combination with a horn having a portion ofits bottom approximately horizontally disposed and the other portion of its bottom curved, the approximately horizontally disposed portion of said bottom being adjacent the discharge extremity of said horn, of a casing forminga'single chamber only, said gcther with the usual arm 12; which arni12 carries the sound diaphragm, and 1S Jourhorn having a single opening only in the bottom thereof bor ered on one side by the curved portion ofthe horn, said curved portion of said horn merging intotsaid opening and the greater portion of said opening bemg formed in the approximately horizontally disposed portion of said horn, said opening being of less area than the cross sectional area of the chamber and establishing communication. between said horn and said chamber, and said opening being in axial alinement with the longitudinal axis of said chamber directly opposite the induction opening of the horn and intersected by the vertical plane of the longitudinal axis of the horn continued in a stralght line the horn, ofa casing forming a single chamher only, said horn havinga single openthe bottom of said horn being curved be-' tween said opening and the induction point of said horn and one side of said opening bordering on said curved portion of the horn, and said opening being in axial alinementwith the longitudinal axis of said chamber directly opposite the induction point of the horn and intersected by the vertical plane of the longitudinal axis of the horn continued in a straight line from the induction point of said horn to the eduction point thereof.

In testimony whereof, I affix my signature in the presence of two witnesses.

HERMAN THIMGAN. \Vitnesses H. B. Ross, JNO. GQPOWELL. 

